US Bridges

520th Ave over Worrell Creek

Fair

Story County, Iowa · 083241610 · Structure no. 000000000314880

Built
1966
59 years old
Condition
Fair
inspected December 2022
Type
Culvert
Concrete Continuous
Length
27 ft
2 main spans
Daily traffic
2,324
2022 count
Owner
County
County Highway Agency

About this bridge

520th Ave over Worrell Creek is a concrete continuous culvert carrying 520th Ave over Worrell Creek in Story County, Iowa. It was built in 1966, so it is 59 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 2,324 vehicles a day, projected to reach 2,324 by 2043. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries520th Ave
CrossesWorrell Creek
Location083241610
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates41.99922, -93.65774
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating38.1 US tons
Inventory rating22.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length27 ft (8.2 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,324 (2022)
Projected traffic2,324 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 520th Ave over Worrell Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is 520th Ave over Worrell Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in December 2022.

How much traffic does 520th Ave over Worrell Creek carry?

About 2,324 vehicles per day (2022 count).

How long is 520th Ave over Worrell Creek?

The structure is 27 ft (8.2 m) long with a longest span of 12 ft (3.7 m).

Who owns 520th Ave over Worrell Creek?

It is owned by the County Highway Agency.